When Teresa's mother hides her favourite doll under a blanket, Teresa acts as if it no longer exists, and she makes no attempt to look for it. Based on this information, you can infer that Teresa is in Piaget's

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Teresa's behavior is indicative of the sensorimotor period of cognitive development, according to Jean Piaget's theory. This stage occurs from birth to about 2 years of age, where children do not yet understand object permanence—the understanding that objects continue to exist even when they cannot be seen, heard, or touched. Teresa's acting as if the doll no longer exists when it is hidden suggests she has not yet developed object permanence, placing her in the sensorimotor stage.

When Teresa's Mother Hides Her Favourite Doll Under a Blanket